nice tank! Well, remember to quarantine any new fish for 2 weeks. Trust me...it'll save you trouble! You could divide.... But you'll need TONS of plants, especially for the sorority. Females and Males can detect each other because of smell.... they give off pheromones of "I'm here" and "I'm sick" and such You can make your own, or buy your own. THIS is the one I have for a 10 gallon http://www.ebay.ca/itm/Lees-AQ2-Aqua...item256344a1b4 and I like it. turdy, flexible and clamps nicely to the sides of the tank without worrying of the hood sitting wonky!

If the tank divider sits about 3 or more inches above the water yes they can be reliable. Take in mind your own fish.... My females, 4 jump so far - and 2 can jump over 4 inches! I also have an aggressive female, and a new aggressive female both of which need to be divided anyways xD

And I know. I had 4 in a 29 long it looked so bare.... xD I have a 40 for them soon. Imagine how bad THAT will be x.x

Honestly, I wouldn't recommend keeping a male in the same water as a sorority. I made the mistake of keeping a female in the water with two males. The girl learned to jump like a rabbit and the boy did literally everything in his power to get to her. One day, I woke up from a nap and they were trying to spawn. :/ Imagine my displeasure. So I am a firm believer in separating the fishie genders. I haven't had any problems with the males in their tanks other than them flaring at one another occasionally. They get bored with each other after a while, lol.